GMC Sierra trailer wiring????

Submitted: Sunday, Jan 26, 2014 at 01:57
ThreadID: 129180 Views:2426 Replies:1 FollowUps:0
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We have just bought a 2006 GMC Sierra and I have been trying to fathom the wiring on the large 7-pin plug already fitted, so as to verify it is wired correctly for the BT and fit a 7-pin flat for our box trailer. I found the TRL PARK fuse was blown and have replaced that but still can't get 12V at any of the pins. When the blinker is on I get a flashing 0L when the multimeter is set to VDC.

Any suggestions please on how to check what is what.
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Reply By: Bobrovin - Sunday, Jan 26, 2014 at 08:08

Sunday, Jan 26, 2014 at 08:08
It may have an isolator fitted. Have you checked with the motor running, Does it have any wire going to pin 2
AnswerID: 587079

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